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Re: [TenTec] Omni VI TCXO

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Omni VI TCXO
From: "Paul Christensen" <w9ac@arrl.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 21 Jan 2007 19:34:31 -0500
List-post: <mailto:tentec@contesting.com>
> Interestingly, if I remember correctly, Scott described at one time on the
> reflector that the TCXO did not have better stability than the earlier
> crystal oven.  They moved to the TCXO because the ovens were becoming
> unavailable.

Sounds right to me.  However, I made the change primarily to have better 
start-up stability without having to leave the power supply running 24/7. 
>From a cold start, the OCXO's frequency makes a relatively large excursion 
until it comes up to temperature.  That said, I found Ten Tec's TCXO to be 
significantly more stable than the OCXO ever was.  After the mod, I don't 
believe I saw more than a 20 Hz change in frequency at 14 MHz -- even from a 
cold start.

If Ten Tec no longer carriers that particular TCXO, many inexpensive 
replacements are available with 0.5 ppm accuracy or better.  The difference 
in price is generally a function of the TCXO's phase noise spec and absolute 
stability required.

Paul, W9AC 

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